U.S. National Archives & Records Administration (NARA), record group 104 (U.S. Mint), entry 1 (General Correspondence, 1792-1857), boxes 36 to 40, scanner images 401 to 800. Scanned under the direction of Robert W. Julian at the NARA Philadelphia facility, operating via a grant from the Central States Numismatic Society. Note, for correspondence, endorsements were generally not copied. Boxes 36 to 40 cover the period March 1854 to May 1855.